https://doi.org/10.1140/epjst/e2008-00498-0
Optical absorption coefficient of laser irradiated wheat seeds determined by photoacoustic spectroscopy
1
Instituto Politécnico Nacional, Sepi-Esime, Zacatenco. Unidad Profesional “Adolfo López Mateos”, Col. Lindavista, CP 07738, Mexico D.F., Mexico
2
Centro Internacional de Mejoramiento del Maíz y el trigo (CIMMYT), 06600 Mexico 6, D.F., Mexico
3
Departamento de Física, Centro de Investigación y de Estudios Avanzados-IPN, A.P. 14740, 07360 Mexico D.F., Mexico
4
Unidad Académica de Física, Universidad Autónoma de Zacatecas, A.P. 580, Zacatecas, Zac., Mexico 98068, D.F., Mexico
Present study is concerned with the photoacoustic (PA) assessment of optical absorption coefficient (β) for treated (soaking in the methylene blue dye) and untreated seeds of wheat. The determination of β, based on the Rosencwaig and Gersho model enables the optical absorption coefficient to be assessed directly from the measured amplitude of PA signal. The obtained β values were statistically analyzed. The outcome of the analysis shows significant differences in β values: in the wavelength range from 600 to 700 nm treated (with dye) seeds have higher β than untreated seeds. These seeds were also irradiated (varying time and intensity) with a laser diode emitting at 650 nm. Germination tests were carried out on both, irradiated and control (no irradiated) seeds. The percentage of normal seedlings from treated seeds was found higher (p ≤ 0.05) than from control seeds.
© EDP Sciences, Springer-Verlag, 2008
